Descartes, René, Renati Des-Cartes principia philosophiae

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="72"/>
              videmus illas eum non impedire. </s>
              <s>Nam ſi, exempli
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              cauſà, corpus durum B moveatur verſus C, ac quae­
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                <arrow.to.target n="fig5"/>
              dam ex partibus fluidi in­
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              termedii D ferantur in con­
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              trarium à C verſus B,
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              motum eius non juvabunt,
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              ſed contrà magis impe­
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              dient, quàm ſi plan eſſent
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              ſine motu. </s>
              <s>Quae difficultas ut ſolvatur, recordandum
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              eſt, non motum, ſed quietem eſſe motui contrariam; &
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              motûs determinationem verſus unam partem eſſe con­
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              trariam ejuſdem determinationi verſus partem oppo­
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              ſitam, ut iam dictum eſt a; itemque omne id quod
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              movetur, tendere ſemper ut pergat moveri ſecundùm
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              lineam rectam b. </s>
              <s>Ex his enim patet: primò,
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              du­
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              rum B, dum quieſcit, magis opponi, ſuà illâ quiete,
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              motibus particularum corporis fluidi D ſimul ſpecta­
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              tis, quàm iiſdem opponeretur ſuo motu, ſi moveretur. </s>
              <s>
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              Ac deinde, quantum ad determinationem, verum qui­
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              dem eſt tot eſſe ex particulis ipſius D, quae
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              à C verſus B, quot ſunt quae moventur in contrarium:
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              quippe epedem ſunt quae, venientes à C, impingunt in
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              ſuperficiem corporis B, ac deinde retorquentur ver­
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              ſus C. </s>
              <s>Et quidem ſingulae ex iſlis ſeorſim ſpectatae, im­
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              pingentes in B, pellunt ipſum verſus ſ, atque
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              ma­
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              gis impediunt, ne moveatur verſus C, quàm ſi eſſent
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              ſine motu; ſed, quia totidem etiam ab F tendunt in B,
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              illudque pellunt verſus C, idcirco, quantum ad hoc
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              attinet B non magis pellitur verſus unam partem </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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